The simulation results indicate that the optimum temperature for ore dissolution is around 25 °C, because, around this temperature, the dissolving ability of solvents to low-grade solid potash...
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Figure 1. Surface coal mining. Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, which forms the mineralized package of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, dimension stone, rock salt ...
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Uranium Extraction Process. The plant was originally designed to treat uranium ores with low lime-high vanadium content from the Lukachukai Mountains. The process utilized is known as the "Acid Cure" and had been developed for the most part by the AEC to increase recovery of vanadium values. Briefly, it involved "pugging" the ore …
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The dissolution of gold could be classified into two categories: (a) dissolution under excess concentration of bromide ions and (b) dissolution under excess concentration of bromine. ... Application of NBS in gold extraction from ore show a high yield of 86.24% under optimal conditions of NBS dosage 0.05 M, liquid-solid ratio 4:1, …
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In leaching a given ore the rate of extraction is not instantaneous but goes on slowly, and the factors of penetration, dissolution, and diffusion, go on simultaneously and not in successive stops. However, these steps can be studied only by segregating them so as to have only one factor entering at a time. ... With 3-inch pieces of ore, an ...
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The effect of solvent chemistry on potassium dissolution extraction from low-grade solid potash ore in Qarhan Salt Lake, China. Appl. Geochem. 115, 1–11 (2020).
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Atmospheric single stage leaching of refractory gold ore was investigated. • Gold extraction showed linear dependency on sulfide oxidation. ... (e.g., carbonaceous, and clays) that may adsorb gold directly after gold dissolution, decreasing the extraction. (La Brooy et al., 1994) Gold can be liberated from refractory ores by physical, thermal ...
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Sample preparation is a critical step in the geochemical analysis, and complete sample dissolution is a pre-requisite for obtaining accurate and precise data for geological materials in most studies. Sample matrix, analytes of interest, the analytical technique, and intended purpose play a major role in selecting the optimum sample …
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Exchange Capacity), reducing the amount of extraction [21]. The present study investigated the leaching behavior of Cu from its oxide ore through-out a weeklong (7 days) experiment using different sizes of ore particles, mimicking the heap environment. A series of experiments were conducted to check the dissolution of
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Abstract Drawing on recent experimental and commercial developments, this review reappraises potential substitute leach reagents for cyanide in the gold mining …
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This was the first commercial method used for gold extraction. Place the ore into the mortar and grind it to the size of sand grains. Put the ore grains into a plastic bowl. Add the 35-percent hydrochloric acid to the sodium hypochlorite bleach into a flask or beaker, in a two-to-one ratio of acid to bleach. Ensure that the liquid mixture is at ...
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Results of dissolution studies showed that the copper oxide ore leaching in H 2 SO 4 solution increase with increasing time, pH, stirring speed and temperature at fixed H 2 SO 4 concentration of 0 ...
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Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly ...
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The results showed that acidity and Fe 3+ ion affected dissolution of both ores significantly; high valence manganese oxide reduction takes precedence which is in control of the Ni, Mn, Cu, and Co dissolution of the nodule; Ni, Cu, and Co extraction from the nickel ore is a course of sulphide minerals oxidative conversion which significantly ...
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LEACHING OF A ROASTED COPPER SULFIDE ORE. Sulphide ores of copper are insoluble in dilute sulphuric acid leaching solutions, but a very high extraction can be obtained if the copper ore is in the oxidized condition. The problem is to convert the sulphide into the oxide form. This can be done by giving the sulphide ore an oxidizing-sulphatizing ...
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A certain amount of retention time is also required for gold dissolution. The discharge from the last leach tank goes to the Primary Filtration Circuit. The Cyanide Leaching Circuit is designed to the following criteria: Leach Slurry Density: 45% solids Slurry pH: 11.0 Cyanide Concentration: 0.5 gm/litre Cyanide Consumption: 0.7 kg/tonne of ore
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The result shows that dissolution rate of gold foil is far away from that in NBS. The gold foil begins to dissolve at day 3 and only partly dissolved at day 10. What's more, the yield of gold leaching from ore by bromine solution is 53.5% lower than that of 86.24% by NBS. That is to say, Br 2 may not be the only factor to make gold dissolved.
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The oxidation of sulfide-based ores is industrially relevant as it facilitates the extraction of valuable metals and eliminates undesired elements from an ore. Even though oxidation can be done thermally (pyrometallurgy), solution-based (hydrometallurgical) methods are currently sought as they represent a more sustainable option. Here, the …
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The effect of time on the leaching of copper oxide ore was investigated at room temperature in the range of 15–240 min. The results are shown in Fig. 1 which indicates that the increase of time on the dissolution of copper oxide ore produced an increase in the dissolution of copper, cobalt and iron.
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Thermophilic archaea often achieve much better metal extraction efficiencies than mesophiles at temperatures up to 85 ℃. They are, however, sensitive to high pulp densities. ... Reductive bioleaching refers to the dissolution of ore or another solid material by a chemical reduction reaction catalyzed by microorganisms. The main reaction is ...
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A completely novel approach to iron extraction was investigated, based on reductive leaching of iron by anaerobic bacteria. Microorganisms were collected from an anaerobic bog where natural seepage of dissolved iron was observed. This mixed culture was used to reduce insoluble iron in a magnetite ore to the soluble ferrous (Fe {sup +2}) …
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A precise understanding of the dissolution kinetics allows to interpret the complex behaviour of the leaching process. Therefore, this research aims to fully …
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Copper for its low-grade ores is majorly extracted by making the usage of the processes of hydrometallurgy. Moreover, the extraction of copper is majorly done by the process of leaching which relates to the use of bacteria. These bacteria leach out the ore and thereby extract copper from the metal compounds.
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Amongst these methods, cyanidation is the most common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen. For refractory ores such as sulfide ores and carbonaceous ores which are not susceptible to direct cyanide leaching ...
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These reagents were successfully used in all four types of sample dissolution: (i) open acid dissolution, (ii) closed low-pressure digestions, (iii) fusion dissolution …
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Most of the gold extraction from ore is accomplished by the implementation of an alkaline cyanide leaching process. The chemical recovery of gold can be defined by two different operations: the oxidative dissolution of gold and the reductive precipitation of metallic gold from the solution. Cyanide is one of the most attractive lixiviants in ...
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The nature of the ore deposit determines the mining and mineral processing techniques applied. Oxide ore deposits are frequently of such low grade (e.g., 3 to 10 parts per million) that extensive mineral processing cannot economically be justified.In this case they are merely shattered by explosives and then piled into heaps for extraction by cyanidation …
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Biomining, the biotechnology that uses microorganisms to extract metals from ores and concentrates, is currently used exclusively for processing reduced ores and mine wastes. Metals of economic value also occur extensively in oxidized ores, such as nickel laterites. While these are not amenable to oxidative dissolution, the ferric iron …
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It required 50 % sodium hypochlorite or 120 kg/t available chlorine to extract 97 % of the gold from the ore. When 3 % HCl and 10 g/L NaCl was added to the leach solution, the same amount of gold could be extracted with 24 kg/t available chlorine under the same conditions. However, the reagent requirement may be further reduced by …
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Synchronous extraction of nickel and copper from a mixed oxide–sulfide nickel ore in a low–temperature roasting system. Journal of cleaner production 177, 371–377 (2018). Article CAS Google ...
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The grade of gold ore is 3 ppm. Also, cyanide leaching is used to process gold in the Aghdareh mine . The main problem in extraction is achieving an acceptable separation of Au from its ore. Thus, the effects of the main controllable parameters affecting gold recovery are evaluated, discussed and optimized.
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Abstract. Dissolution of metals in organic solvents is relevant to various application fields, such as metal extraction from ores or secondary resources, surface …
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The raw material used in this study was low-grade manganese clay with a grade of 6.1% Mn, and the main manganese mineral was pyrolusite. FeCl 2 ·4H 2 O and a dilute hydrochloric acid solution were selected as the most effective reductant and solvent, and the leaching efficiency of manganese and iron was greater than 92% and 70%, …
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Though the dissolution process of niobium-tantalite ore has been extensively studied in the literature, there still exists considerable ambiguity as to the change of charge density and energy and coordination structure and the selective dissolution mechanisms in the research field. ... Although solvent extraction is a well-established and ...
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The sample used can be a portion of a polished section of ore or concentrate that has previously been characterised by microbeam techniques, so that dissolution can be related to mineralogical factors, e.g. composition, zonation, inclusions etc., thus providing direct information of practical use for designing a processing circuit.
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Hua et al. 15 investigated the quick H 2 SO 4 leaching of a Zn silicate ore at a constant S/L = 1/10 in the presence of microwave irradiation and reached the maximum Zn extraction of 99.08%.
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